海洋工程装备异种材料的电偶腐蚀兼容性

针对海洋工程装备产品的腐蚀评价需求及当前试验方法适用性差的弊端，提出一种适用于海洋工程装备异种材料电偶腐蚀兼容性评价方法，设计并制作一套海水环境下电偶腐蚀敏感性测试装置，在静态和动态2种全浸海水环境下对8种电偶对进行了电偶腐蚀兼容性评价试验。结果表明：相比实海挂片试验方法和薄液膜下电偶腐蚀试验，静态/动态海水全浸电偶腐蚀敏感性试验装置更适用于海洋工程装备异种材料电偶腐蚀兼容性的评价；由于偶对回路中阴阳极金属极化率的影响，电偶腐蚀电流密度与试验条件关联性远强于腐蚀电位差，电偶腐蚀电流密度更适宜作为海洋工程装备异种材料电偶腐蚀兼容性的评价判据。     

舰船海水管路系统电偶腐蚀控制技术

进入新世纪以来,舰船海水管路系统材料逐步发展为以铜镍合金为主干材料,铸造青铜合金为配套材料的材料体系,同时钛及镍基合金的比例持续升高。这些高电位金属一方面大幅提升了海水管路的耐海水腐蚀性能,尤其是耐冲刷腐蚀性能,另一方面也提高了钛、镍基合金管路与低电位的铜合金管路及附件连接时的电偶腐蚀风险。为应对钛及镍基合金应用带来的上述风险,美国等国外海军通过长期试验研究,对于舰船海水管路系统电偶腐蚀控制系列技术进行了充分评估和考核验证。本文论述国外海军舰船海水管路系统电偶腐蚀控制技术研究的重点方向以及相关考核试验结论,为我国同领域的技术发展提供参考借鉴。     

船舶的电化学腐蚀及防止措施

一船舶电化学腐蚀的种类金属表面与离子导电的电解质溶液发生电化学作用产生的破坏,称为电化学腐蚀。船上的电化学腐蚀一般为局部腐蚀,常见的腐蚀主要有以下几种:(1)电偶腐蚀船上零件只要能构成异金属接触电池,就会发生电偶腐蚀。这种腐蚀较为普遍,例如离心泵的叶轮与泵轴,冷凝器的碳钢壳体与黄铜管子等构成的腐蚀,即为电偶腐蚀。(2)氧浓差腐蚀金属零件与含氧量不同的溶液接触,就会形成氧浓差电池。溶液含氧浓度越高,电极的电位就越高,成为阴极,与含氧浓度低的溶液接触的电极成为阳极,阳极被腐蚀。例如柴油机气缸套与气缸体下部密封圈处的缝…     

钛及钛合金在国外舰船上的应用

钛及钛合金具有高比强度、无磁、耐腐蚀等一系列优点,是一种优异的海洋材料。本文概述钛及钛合金的性能特点,梳理美国、俄罗斯等国家在深潜器和舰船上应用钛合金的情况,研究钛合金在国外舰船上应用的关键技术,包括焊接工艺、电偶腐蚀和生物防污等,最后总结钛及钛合金在国外舰船上的应用情况。     

钛及钛合金在国外舰船上的应用

钛及钛合金具有高比强度、无磁、耐腐蚀等一系列优点,是一种优异的海洋材料。本文概述钛及钛合金的性能特点,梳理美国、俄罗斯等国家在深潜器和舰船上应用钛合金的情况,研究钛合金在国外舰船上应用的关键技术,包括焊接工艺、电偶腐蚀和生物防污等,最后总结钛及钛合金在国外舰船上的应用情况。     

防止铝质舰载设备电偶腐蚀的对策

针对铝质舰载设备常年处于高湿度、高盐分、污染重的环境中，腐蚀问题非常严重的现象，介绍了铝及铝合金电偶腐蚀的形成原因及过程，详细分析了造成电偶腐蚀的各种因素，并提出了相应的对策，对类似的铝及铝合金产品的开发具有现实借鉴意义。     

舰船海水管系电偶腐蚀及其防护措施

HDR双相不锈钢和B10铜镍合金是舰船海水管系中广泛使用的两种金属材料,当与其他金属在海水中偶接,就必然会发生电偶腐蚀。发生电偶腐蚀过程的根本原因是溶液中有去极化剂存在。文章从腐蚀电化学的某些层面厘清HDR、B10海水管系电偶腐蚀的机理,分析了海水管系电偶腐蚀的原因,并提出若干防护措施。     

某型潜艇杯形管节的腐蚀与防护对策

文章对某型潜艇的杯形管节发生的腐蚀原因进行了分析,认为杯形管节腐蚀的主要原因是其自身材料耐蚀性较差且缺少必要的防护措施,表现为以均匀腐蚀为特征的全面腐蚀和以电偶腐蚀为特征的局部腐蚀,最后提出了预防杯形管节腐蚀的技术措施。     

船用离合器摩擦靴腐蚀故障分析与防护对策

某船用离合器在使用过程中摩擦靴与矩形销出现了腐蚀现象.文章对这种腐蚀现象进行分析,提出了多种隔离防护方案,并通过相关试样耦合的电偶腐蚀试验研究及试样盐雾试验研究,对比筛选出较优的配对耦合,作为最终的防护实施对策.     

三峡船闸输水廊道反弧门涂层失效及腐蚀原因分析

为保障三峡船闸输水廊道反弧门的运行安全，在2021和2022年三峡船闸计划性停航检修期间，对南北两线船闸反弧门的腐蚀状况进行检测和评估，分析其防腐蚀涂层起泡破坏及门体腐蚀的原因。结果表明，反弧门涂层存在大面积起泡、剥落，门体及构件的局部腐蚀问题凸显，涂层损伤及锈蚀面积约占反弧门检测面积的20%。反弧门原有涂装材料和热喷锌层仍能发挥防腐蚀作用，尚不需要进行大面积维修，但对于局部腐蚀和涂层破坏明显的区域，应及时修复，并加强检测、维护，避免发生腐蚀失效威胁门体安全。同时，针对反弧门遭受的高速水流冲蚀、空蚀以及电偶腐蚀耦合破坏问题，提出进行反弧门表面高弹、抗冲耐磨防护材料修复以及施加牺牲阳极阴极保护防护试验研究的建议。     

热带海洋大气环境中3004系列铝和铜电化腐蚀行为研究(英文)

The galvanic corrosion behaviour of aluminium 3004 and copper with different area ratios were studied in the tropical marine atmosphere at Tuticorin harbour over a period of 426 days. The area ratios of AAl : ACu, studied were 1:1, 1:2, 1:4, 1:8, 2:1, 4:1 8:1. The galvanic corrosion behaviour of metals was studied in terms of relative increase in the corrosion rate of aluminium due to galvanic coupling with copper, relative decrease in the corrosion rate of copper due to galvanic coupling with aluminium, and the susceptibility of aluminium to pitting owing to galvanic coupling with copper. The galvanic potential and galvanic current of the system were monitored. Pits of different dimensions ranging from mild etchings to perforations were experienced on the borders and the surfaces of the interface of aluminium in contact with copper. The weathering parameters and the environmental pollutants which have a major role in influencing the galvanic corrosion of metals were also monitored. The corrosion products resulting from galvanic corrosion were analysed using XRD and the pitting on aluminium resulting from galvanic corrosion has been highlighted in terms of pit depth, size and density of pit, using a high resolution microscope.     

Galvanic corrosion behaviour of aluminium 3004 and copper in tropical marine atmosphere

The galvanic corrosion behaviour of aluminium 3004 and copper with different area ratios were studied in the tropical marine atmosphere at Tuticorin harbour over a period of 426 days. The area ratios OfAAI： Acu, studied were l：l, 1：2, l：4, 1：8, 2：1, 4：1 ＆ 8：1. The galvanic corrosion behaviour of metals was studied in terms of relative increase in the corrosion rate of aluminium due to galvanic coupling with copper, relative decrease in the corrosion rate of copper due to galvanic coupling with aluminium, and the susceptibility of aluminium to pitting owing to galvanic coupling with copper, The galvanic potential and galvanic current of the system were monitored. Pits of different dimensions ranging from mild etchings to perforations were experienced on the borders and the surfaces of the interface of aluminium in contact with copper. The weathering parameters and the environmental pollutants which have a major role in influencing the galvanic corrosion of metals were also monitored. The corrosion products resulting from galvanic corrosion were analysed using XRD and the pitting on aluminium resulting from galvanic corrosion has been highlighted in terms of pit depth, size and density of pit, using a high resolution microscope.     

天然海水中HE15/MDN138和HE15/MDN250合金的原电池反应（英文）

HE15 is a heat treatable high strength alloy with excellent machinability find wide applications in aerospace and defence industries. In view of their excellent mechanical properties, workability, machinability, heat treatment characteristics and good resistance to general and stress corrosion cracking, MDN138 MDN250 have been widely used in petrochemical, nuclear and aerospace industries. The galvanic corrosion behaviour of the metal combinations HE15/MDN138 and HE15/MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250 and HE15 of the individual metal, the galvanic potential and galvanic current of the couples HE15/MDN138 and HE15/MDN250 were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with HE15 were analyzed using XRD. The electrochemical behaviors of MDN138, MDN250 and HE15 in seawater have been studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with HE15 have been examined with scanning electron microscope. The results of the study reveal that HE15 offered required amount of protection to MDN138 MDN250.     

天然海水中15CDV6/MDN138及15CDV6/MDN250合金的电流相互作用（英文）

The galvanic corrosion behavior of the metal combinations 15 CDV6/MDN138 and 15 CDV6/MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250, and 15 CDV6 of the individual metal, the galvanic potential and galvanic current of the couples 15 CDV6/MDN138 and 15 CDV6/MDN250, were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with 15 CDV6 were analyzed using XRD. The electrochemical behavior of MDN138, MDN250, and 15 CDV6 in seawater was studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with 15 CDV6 have been examined with a scanning electron microscope. The results of the study reveal that the galvanic protection offered by15 CDV6 to MDN250 and MDN138 in natural seawater amounts to 93% and 98%, respectively, implying that the galvanic protection offered by 15 CDV6 is continuous and effective, which has been further evinced from the adherent nature of the calcareous deposit film comprising compounds such as CaCO_3(calcite, aragonite, and vaterite), MgCO_3(magnesite),Mg(OH)_2(brucite), and MgO(brucite).     

Galvanic interactions of HE15 /MDN138 & HE15 /MDN250 alloys in natural seawater

HE15 is a heat treatable high strength alloy with excellent machinability find wide applications in aerospace and defence industries. In view of their excellent mechanical properties, workability, machinability, heat treatment characteristics and good resistance to general and stress corrosion cracking, MDN138 & MDN250 have been widely used in petrochemical, nuclear and aerospace industries. The galvanic corrosion behaviour of the metal combinations HE15 /MDN138 and HE15 /MDN250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI’s Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN138, MDN250 and HE15 of the individual metal, the galvanic potential and galvanic current of the couples HE15 /MDN138 and HE15 /MDN250 were periodically monitored throughout the study period. The calcareous deposits on MDN138 and MDN250 in galvanic contact with HE15 were analyzed using XRD. The electrochemical behaviors of MDN138, MDN250 and HE15 in seawater have been studied using an electrochemical work station. The surface characteristics of MDN138 and MDN250 in galvanic contact with HE15 have been examined with scanning electron microscope. The results of the study reveal that HE15 offered required amount of protection to MDN138 & MDN250.     

石油钻井平台输油钢管开裂原因分析

通过金相检验,化学成分分析以及扫描电镜分析,石油钻井平台用钢管的早期失效原因是焊缝发生海水电偶腐蚀和缝隙腐蚀造成。     

海水中HE 20/MDN 138&HE 20/MDN 250合金电化学腐蚀行为研究（英文）

In view of their excellent mechanical properties, workability and heat treatment characteristics, MDN 138 MDN 250 have been widely used in missile, rocket and aerospace industries. With light weight and high performance characteristics HE 20 aluminium alloy acts as an important material in defence and aerospace applications. The galvanic corrosion behaviour of the metal combinations HE 20 / MDN 138 and HE 20 / MDN 250, with 1:1 area ratio, has been studied in natural seawater using the open well facility of CECRI's Offshore Platform at Tuticorin for a year. The open circuit potentials of MDN 138, MDN 250 and HE 20 of the individual metal, the mixed potential and galvanic current of the couples HE 20 / MDN 138 and HE 20 / MDN 250 were periodically monitored throughout the study period. The calcareous deposits on MDN 138 and MDN 250 were analysed using XRD. The results of the study reveal that that HE 20 has offered required amount of protection to MDN 138 MDN 250.